Heh. Sincerely, I play videogames because of the audiovisual experience they provide. I go for games that please my eyes and ears (and in that sense I don't mean just raw audio and video quality, but also the story both these mediums provide). Good to excelent gameplay is, no doubt about it, a must. Good, excelent gameplay can, was, and most doubtlessly will be provided by any kind of controller.
To me, what matters the most is which console will provide me with the best audiovisual experiences.
When I want to do something that gives me the best physical experiences, I go play soccer, I go play tennis, I go swimming.
So really, what really matters to me is that the console I have accomplish its objective as an audiovisual entertainment system.
Wii tries and takes gaming to a new level, to a certain extent. It tries and "changes gaming from just an audiovisual experience", something that many peripheral hardware for many consoles and other computer systems have actually already done, many, many times. But still, it is an audiovisual entertainment system. Unless it provides audiovisual experience as good as PS3, I really see no reason to having it.
What I see is: Unless Wii has a game library at least nearly as good as PS3, it should fade out sooner or later. People buy it like potato chips because it's cheap, it's innovative, why not have a little white thingy that plays stuff which when I swing the remote controller a little big-headed thingy on the screen swings something as well for just $250?
But unless it keeps people interested, and for that they will need a nice library, they should be screwed. I mean, they are helping to bring more consumers into the gaming industry, but unless these people are kept interested their strategy should end up backfiring. I mean, you start liking videogames, but then the system that put you into it simply stops providing you the fun it once did, so you would logically move to something that would.
And well, as things seem to be, the audiovisual standpoint ends up being the number one factor of gaming. There have always been dozens of more-than-usual interactive options in gaming industry, but they always end up dying in the hands of games with higher audiovisual quality (not to forget that's not just raw audio and graphics power, but their ability to deliver a good, fun story as a medium).
It's freaking way to soon to say which console is going to be the most successful. But indeed, if we only consider the head start, Wii pretty much fucked PS3 and X360 nicely.